Joe Klein's 'dos and don'ts'

(CNN) -- Do stand firm on the issues, don't sigh and absolutely no looking at your watch. What are the key "dos and don'ts" for Vice President Dick Cheney and Sen. John Edwards in the vice presidential debate?

Joe Klein, Time magazine political columnist and regular political contributor on CNN's "Paula Zahn NOW Prime Time Politics," will offer his tips before each debate. You can use this list as a viewer's guide for Tuesday's vice presidential debate and see how the candidates stack up.